Folsom Lake Crossing. folsom lake trails map. State Recreation Area. P a rk w a y. East Natoma St. Folsom Lake. The Posted Order with map of the closure area can be found here. . There is no trail access or alternate route within Folsom Lake State Recreation Area. Main Body. If you took any photos please post them in the comments. F ra n c is c o. Trail Map. Success at our Poker Ride! Thank you to everyone who attended. Green Valley Rd. D r. S o p h ia.